(2003). Precaution, envirnmental science, and preventive public policy. Washington: Island Press.
Dyfyniad Arddull ChicagoPrecaution, Envirnmental Science, and Preventive Public Policy. Washington: Island Press, 2003.
Dyfyniad MLAPrecaution, Envirnmental Science, and Preventive Public Policy. Washington: Island Press, 2003.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.